netdev - Re: [PATCH ethtool 0/2] improve the logic of fallback from netlink to ioctl

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Date:   Wed, 13 May 2020 15:58:14 -0400
From:   "John W. Linville" <linville@...driver.com>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH ethtool 0/2] improve the logic of fallback from netlink
 to ioctl

On Wed, Apr 29, 2020 at 12:30:00AM +0200, Michal Kubecek wrote:
> At the moment, ethtool falls back to ioctl implementation whenever either
> in response to request type not implemented in kernel or netlink interface
> is unavailable or netlink request fails with EOPNOTSUPP error code. This is
> not perfect as EOPNOTSUPP can have different meanings and we only want to
> fall back if it is caused by kernel lacking netlink implementation of the
> request. In other cases, we would needlessly repeat the same failure trying
> both netlink and ioctl.
> 
> These two patches improve the logic to avoid such duplicate failures and
> improve handling of cases where fallback to ioctl is impossible for other
> reasons (e.g. wildcard device name or no ioctl handler).
> 
> Michal Kubecek (2):
>   refactor interface between ioctl and netlink code
>   netlink: use genetlink ops information to decide about fallback
> 
>  ethtool.c          |  51 +++---------
>  netlink/extapi.h   |  14 ++--
>  netlink/monitor.c  |  15 +++-
>  netlink/netlink.c  | 193 ++++++++++++++++++++++++++++++++++++++-------
>  netlink/netlink.h  |   6 ++
>  netlink/parser.c   |   7 ++
>  netlink/settings.c |   7 ++
>  7 files changed, 220 insertions(+), 73 deletions(-)

Thanks (belatedly) -- queued for next release!

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@...driver.com			might be all we have.  Be ready.